<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo" />
        <MyList
          :todos="todos"
          :checkTodo="checkTodo"
          :deleteTodo="deleteTodo"
        />
        <MyFooter
          :todos="todos"
          :checkAllTodo="checkAllTodo"
          :clearAllTodo="clearAllTodo"
        />
      </div>
    </div>
  </div>
</template>

<script>
  import MyHeader from "./components/MyHeader"
  import MyList from "./components/List"
  import MyFooter from "./components/MyFooter.vue"

  export default {
    name: "App",
    components: { MyHeader, MyList, MyFooter },
    data() {
      return {
        //由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
        todos: [
          { id: "001", title: "抽烟", done: false },
          { id: "002", title: "喝酒", done: false },
          { id: "003", title: "开车", done: true },
        ],

        // todos: JSON.parse(localStorage.getItem("todos")),
      }
    },
    methods: {
      //添加一个todo
      addTodo(todoObj) {
        this.todos.unshift(todoObj)
      },
      //勾选or取消勾选一个todo
      checkTodo(id) {
        this.todos.forEach((todo) => {
          if (todo.id === id) todo.done = !todo.done
        })
      },
      //删除一个todo
      deleteTodo(id) {
        this.todos = this.todos.filter((todo) => todo.id !== id)
      },
      //全选or取消全选
      checkAllTodo(done) {
        this.todos.forEach((todo) => {
          todo.done = done
        })
      },
      //清除所有已经完成的todo
      clearAllTodo() {
        this.todos = this.todos.filter((todo) => {
          return !todo.done
        })
      },
    },
    watch: {
      todos(value) {
        localStorage.setItem("todos", JSON.stringify(value))
      },
    },
  }
</script>

<style>
  /*base*/
  body {
    background: #fff;
  }
  .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
      0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
  }
  .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
  }
  .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
  }
  .btn:focus {
    outline: none;
  }
  .todo-container {
    width: 600px;
    margin: 0 auto;
  }
  .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }
</style>
